Enable "Check into meeting" by selecting the checking-in timeframe (5, 15 or 30 minutes). Participants will then need to check in on Joan by pressing on the checkmark next to the meeting 5, 15 or 30 minutes after or before the meeting. If they don’t, the meeting will be removed from the calendar and the room will free up. Disable the feature by selecting Off.

"Check into meeting" releases booked meeting rooms if nobody confirms the meeting has in fact started, increasing work productivity.